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MathGroup Archive 1998

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Re: Please help: How to assert that an object is a matrix ???


  • To: mathgroup@smc.vnet.net
  • Subject: [mg12004] Re: Please help: How to assert that an object is a matrix ???
  • From: Adrian Cable <megalith@jimc.demon.co.uk>
  • Date: Fri, 17 Apr 1998 03:40:40 -0400
  • Organization: MeGALiTH Software Ltd
  • References: <6gr6j7$8mf@smc.vnet.net>

> where GL, GT, IL, etc., are not elements but (sub-)matrices themself. I
> want to perform algebraic transformations on A, but I want element
> multiplication to be non-commutative and inversion to use Inverse
> rather than 1/element.
> 
> Can I somehow trick Mathematica to assume that elements are matrices?

I may have misunderstood the question, but, for example, if you wish GL
to be a general 2x2 matrix, have you tried something like:

	GL = {{a,b},{c,d}}

Thanks, cheers,
Adrian Cable.



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